.middle > div {
    border: 1px solid gray;
}

/*----------------------------------propaganda---------*/
.propaganda {
    display: flex;
    justify-content: center;
}

.propaganda > div > div:nth-child(1) {
    display: flex;
    justify-content: center;
    align-items: center;
}

.propaganda > div > div:nth-child(1) > div:nth-child(1) {
    color: rgb(230, 145, 55);
    font-size: 40px;
}

.propaganda > div > div:nth-child(1) > div:nth-child(2) {
    color: gray;
    font-size: 10px;
}

/*--------------------------*/
.middle  .border-top-padding {
    display: flex;
    flex-direction: column-reverse;
}


#container {
    overflow: hidden;
    width: 100%;
    height: 500px;
    margin: 0;
    font-family: "微软雅黑";
}